Aluminum and other pistons



SALTER ALUMINUM AND OTHER PISTONS Dec. 14 1926.

Filed June 6. 1925 'Inuentor j G.5q/Li Patented Dec. 14, 1926.

GLYNN SALTER, OF HOBART, TASMANIA, AUSTRALIA, ASSIGNOR OF ONE-FOURTH TO' ARTHUR JOHN LEWIS ECKERS'LEY, OF SOUTH MELBOURNE, AUSTRALIA, AND ONE- FOURTH T0 WILHELM HEINRICH NICHTERLEIN, OF MELBOURNE, AUSTRALIA.

ALUMINUM AND OTHER PISTONS.

Application filed June 6, 1925, Serial No. 35,870, and in Australia July 3, 1924.

This invention has reference to the construction of pistons of internal combustion engines and particularly to aluminum pistons and has for its ob ect to minimize the slapping of a loose piston in its cylinder.

According to the invention, a piston is.

i made with a portion of the skirt removed at a part in a line at right angles to the axis of the gudgeon pin. The removal of this part provides an opening that is fitted with a flanged plate or slipper of any suitable metal curved to a proximately the same radius as the cylin er and which has its movements controlled by a spring or springs retained within the hollow piston. The ordinary piston rings are also employed.

By this arrangement of parts the slipper will, in a hot cylinder, be caused to pro ect slightly beyond the piston and while it is in contact with the cylinder the opposite side of the piston will, for the full depth of its skirt, be kept close to the cylinder wall.

In the accompanying drawings- Fig. 1 is a perspective'view of a piston fitted with my improvement.

Fig. 2 shows the same in transverse sectional elevation, and

Fig. 3 is a like view to Fig. 2, the section being through the gudgeons.

The piston 4 is of the ordinary type but a portion of the skirt is removed and the opening 5 filled by the curved plate 6. This plate is held, preferably, upon an inverted U-shaped fiat spring 7 the ends of which are mounted, the one end in the plate 6 and the other at a point in the piston diametrically opposite. The plate 6 is adapted to slightly project through the opening 5 and 1t 1s fitted with flanges 10 that limit its movement outwardly in-the iston.

The amount 0 projection of the slipper plate through the piston under normal conditions will vary with the amount of expansion of the piston in which it is fitted. In anycase the flanges 10 are set and ada ted to prevent an further projection ot er than that pre etermined and provided for, in order that the piston, plus the projections, shall be an easy fit in the cylinder. The rings 8 are in the piston above the plate or slipper and when the piston is placed in a cylinder 9 the effect of the sprin controlled plate will be to press one part 0 the piston against the cylinder while at the same time pressing the rings at that part inwards flus or nearly so, with the piston, with a corresponding projection of the rings at the opposite part 1 above the plate 6.

The function of the spring 7 is to exert an outward pressure upon the slipper which would project far enough from a piston having more than ample clearance in a cylinder to take up the clearance which, in or-.

ton not having more than an ample clearance in the cylinder and in this case it is intended that the fitted slipper will permit of pistons being installed in an engine the cylinders of which will have diameters about equal to the diameter of the pistons plus the dimensions of the slipper projection therefrom.

Thus, by means of the invention, old and worn pistons can be improved and slap, with its ensuing inconveniences, be minimized, if not avoided altogether.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. In a piston, a skirt having an opening therein in a line at right angles to the axis of the gudgeons, a plate in said opening,

flanges on the plate limiting the outward.

movement thereof through the opening, and spring means tending to displace the plate outwardly.

2. Ina piston having an opening in the skirt thereof at a point at right angles to the gudgeons, a plate adapted to project slightly through said opening, a tension spring between the plate and opposite side name to this specification.

, enses vetted U-sheped flat spring between the plate and the opposite side of the piston tending to displace the plate outwardly, and 10 movement limiting flanges on said plate.

In testimony whereof I have signed my GLYNN SALTER. 

